Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/sinch/sinch-plugins/faxnpx skills add sinch/sinch-plugins --skill faxgit clone --depth 1 https://github.com/sinch/sinch-pluginsWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00064 | $0.02815 |
| Opus 5 | $0.00032 | $0.01407 |
| Sonnet 5 | $0.00013 | $0.00563 |
| Haiku 4.5 | $0.00006 | $0.00281 |
Grade A, and why
sinch-fax-api scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
2. **Approach** — SDK or direct API calls (curl/fetch/requests)? This is a copy
100% identical to sinch-fax-api — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 167 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Sinch Fax API
Overview
The Sinch Fax API lets you send and receive faxes programmatically. It supports multiple file formats, webhooks for incoming faxes, fax-to-email delivery, and automatic retries. Used for healthcare, legal, financial, and government applications where fax remains a required communication channel.
Agent Instructions
Before generating code, gather from the user (skip any item already specified in the prompt or context):
- Use case — sending, receiving, fax-to-email, or managing services?
- Approach — SDK or direct API calls (curl/fetch/requests)?
- Language — for SDK: Node.js (preview) or .NET (partial). For direct API: any language, or curl. Java and Python must use direct HTTP — there is no SDK wrapper.
When the user chooses SDK, refer to the sinch-sdks skill for installation and client initialization, then to the Fax API Reference linked in Links.
When the user chooses direct API calls, refer to the Fax API Reference linked in Links for request/response schemas.
Security: See the Security section below for url fetching policy, handling inbound webhook content, and credential handling.
Source of Truth — what to load, and what is authoritative
This skill has two kinds of content with UNEQUAL reliability. Follow this precedence:
- Canonical docs at
developers.sinch.com(AUTHORITATIVE). The.mddoc links in this skill are the single source of truth for exact request/response schemas, field names and nesting, enum values, signature/auth schemes, and limits. Before writing code that constructs a payload, verifies a signature, or parses a callback/response, fetch the specific linked doc and confirm the exact shape there. Fetching first-partydevelopers.sinch.comURLs is permitted by the Security/URL policy. Never invent, guess, or pattern-extrapolate a documentation URL — only fetch doc URLs written verbatim in this skill or reached by following a link on a page you already fetched; a trusted domain does not make a guessed path real. - This SKILL.md's own tables, field lists, and snippets (SUMMARIES — not authoritative). They orient you and point at the right canonical doc; they may lag, omit fields, or simplify nesting. Use them to decide what to build and which doc to open. Do NOT transcribe a field name, nesting, encoding, or enum from this file into shipped code without confirming it in the tier-1 doc. If a detail appears only in a summary, treat it as unverified and say so.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 167 lines · 64 tokens per session scan A 12df9b274a70
sinch-fax-api is a skill published in the GitHub repository sinch/sinch-plugins (6 stars, last pushed 20d ago), licensed Apache-2.0. It adds 64 tokens to every session and 2,815 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). It is 100% identical to sinch-fax-api, differing in 0 lines, and is treated as a copy.
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